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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Company's share of equity (Company's basis) | $ 233,478 us-gaap_EquityMethodInvestments |  | $ 225,004 us-gaap_EquityMethodInvestments |
Unconsolidated Real Estate Ventures [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net property | 1,294,503 bdn_EquityMethodInvestmentSummarizedFinancialInformationNetProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  | 1,281,282 bdn_EquityMethodInvestmentSummarizedFinancialInformationNetProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |
Other assets | 180,803 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  | 195,121 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |
Other liabilities | 59,829 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  | 68,481 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |
Debt | 969,322 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  | 965,077 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |
Equity | 446,155 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  | 442,845 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |
Company's share of equity (Company's basis) | $ 233,478 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | [1],[2] | $ 225,004 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | [1],[2]
[1] | This amount includes the effect of the basis difference between the Company's historical cost basis and the basis recorded at the Real Estate Venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from the impairment of investments, purchases of third party interests in existing Real Estate Ventures and upon the transfer of assets that were previously owned by the Company into a Real Estate Venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the Real Estate Venture level.
[2] | Does not include the negative investment balance of one real estate venture totaling $1.2 million as of March 31, 2015 and December 31, 2014, respectively, which is included in other liabilities.

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